@article{fdi:010075506, title = {{P}remonsoon/postmonsoon {B}ay of {B}engal tropical cyclones intensity : role of air-sea coupling and large-scale background state}, author = {{N}eetu, {S}. and {L}engaigne, {M}atthieu and {V}ialard, {J}{\'e}r{\^o}me and {S}amson, {G}. and {M}asson, {S}. and {K}rishnamohan, {K}. {S}. and {S}uresh, {I}.}, editor = {}, language = {{ENG}}, abstract = {{T}he densely populated {B}ay of {B}engal ({B}o{B}) rim witnesses the deadliest tropical cyclones ({TC}s) globally, before and after the summer monsoon. {P}revious studies indicated that enhanced salinity and reduced thermal stratification reduce cooling under {B}o{B} {TC}s after the monsoon, suggesting that air-sea coupling may favor stronger {TC}s during that season. {U}sing observations and simulations from a one fourth degree regional ocean-atmosphere model, we show that {B}o{B} {TC}s are stronger before the monsoon due to a more favorable large-scale background state (less vertical wind shear and higher sea surface temperature). {A}ir-sea coupling however alleviates this background state influence, by reducing the number of premonsoon intense {TC}s, because of larger cooling and reduced upward enthalpy fluxes below {TC}s during that season. {A}s the impact of air-sea interactions on {B}o{B} {TC}s is largest for intense {TC}s, it should be further investigated for {C}ategory 3 and above {TC}s, which are not reproduced at one fourth degree resolution.}, keywords = {tropical cyclones ; {B}ay of {B}engal ; air-sea coupling ; cold wake ; coupled ; ocean-atmosphere model ; {OCEAN} {INDIEN} ; {BENGALE} {GOLFE}}, booktitle = {}, journal = {{G}eophysical {R}esearch {L}etters}, volume = {46}, numero = {4}, pages = {2149--2157}, ISSN = {0094-8276}, year = {2019}, DOI = {10.1029/2018gl081132}, URL = {https://www.documentation.ird.fr/hor/fdi:010075506}, }